液滴撞击不同湿润性固壁面上静止液滴的格子Boltzmann研究

采用单组分多相的伪势格子Boltzmann方法，在大小液滴粒径比为1.5的情况下，对大液滴竖直撞击壁面上静止小液滴的过程进行模拟，研究亲水与超疏水壁面上大液滴竖直碰撞小液滴的过程，得到液滴铺展因子和相对高度随时间的变化。结果表明：增大We数会使液滴的铺展因子增大，铺展直径变大，相对高度减小；并且随着We数的增加，在超疏水表面，液滴在铺展过程中底部会出现空腔，空腔大小随着We数增大而增加；此外，We数增加到107.35时，液滴发生了断裂。

Lattice Boltzmann Study of a Droplet Impinging on a Stationary Droplet on a Fixed Wall Surface with Different Wettability

A single-component multi-phase pseudo-potential lattice Boltzmann method is used to simulate the process of a large droplet vertically hitting a stationary small droplet on a wall with different wettability. The size ratio of the droplets is 1.5. Hydrophilic and superhydrophobic wall surfaces are studied. The droplet spreading factor and relative height are obtained. It shows that as We number increases the spreading factor of the droplet increases, the spreading diameter increases and the relative height reduces. And as We number increases, on a superhydrophobic surface, a cavity appears at the bottom of the spreading process and size of the cavity increases. In addition, as We number increases to 107.35 the droplet breaks.